I can't find the right size allen wrench to remove the two bolts that hold the brake caliper. These are the two that have the little rubber sleeves around them. the 4x4explor.com Aussie locker install write-up says to remove them with a 1/2" socket, but they're working on a TJ. The other write-up I'm looking at makes no real mention of them but that's on a '91... Haynes implies that the caliper design is different in pre-1990 models (mine is an '87).

When I did my calipers they were the external style torx on mine and the PO buggered them up so bad I had to use a pipe wrench to get them off. The new calipers cam with new bolts thank god and they were 3/8 or 10mm I am not sure which. I have no idea what they came from the factory with.